Automatic control for a band-brake.



e. P. WERN.

' AUTOMATIC-CONTROL FOR A BAND BRAKE.

.' APPLIOATION FILED FEB-26, 1912. RENEWED FEB. 2, 1314.

' Patented Sept. .1, 1914.

WITNESSES llllllkllllmt IN'VENTOR.

t4 TTORNE y.

I conjunction therewithg 1" .i q

'Theobj ectof the invention s; to provide a have=-invented certain new and useful .Im

i a. provem ents in iAutomatic Control .iior a BanhBiake,

of which the 'following f snaspecification... 1 p g,

This invention relates to brake -construc ,tion 1 and more particularly to an; automatic controlling'mechanism adapted to-operate devicewhichmay beus'ed in connection with a band brake which shall .a1 tomaticallyre-v lease the same to ,permitwmovement of the brake drum in one direction" and;automatically tighten the band to cause the' same to V l b ked emeeainstimeremen in the reverse direction. In carrying out the nve band brake of, ordinary construction in 'which, however,-the band is preferably constructed of spring material which tends to spring away from the periphery of the brake drum. The ends of thebrakebanda're'at. tached to a movable support, the points of;

attachment having a peculiar" arrangement 'in relation to each otherand the member to which the bandis attached being provided with beams for movingthe same as the brake drum starts to move, as will be more fully explained hereinafter.

- In the drawings accompanying this specification I have illustrated my invention in a a simple form, omitting the mechanism which the brake drum is connected.

In the drawings like partsfin the several views'have been merals. 1 y t Figure 1 is a side elevation of a brake em- 2 is an edgewise view, artially in sectiomof Fig. 1. i

A brake rum 1 is mounted upon a shaft2 which is connected with the mechanism to be given similar reference nucontrolled by the brake, all ofwhich may bemounted upon a suitable support or frame such as 3. A'jbrake band a surrounds the periphery of the brake drum 1 and may be provided with suitable contact members such as 6 and g ides 7. This brake band 4 is "preferably constructed of spring steel or other suitable material which tends to spring outwardly when loosened and so ,free the contact members 6 from engagement with the drum 1. One end of the brake band 4 "tit-111i meat-t" i watts; br iifiw, YLOY KL mounted and: free .toimove :upon a support 10 secured to the frame? ,The. opposite endof the. brake Eband A, (is secured at? 11 :to the movable member .9 by means 'of theiyoke 12 i1 1' was of ea esf1 imi edepta ;1914: bruary26,1912J8eria1'K 1680965 Renewed February @1914. seam; sie,osa.

and the adjustable screw threaded connec;

tionl A rotatablememher 14, preferably of; yieldinggmaterial such; as rubber l or leather, is I meunted upon the movablefmem+ ber 9 with itsperiphery in engagement with thezperiphery "of, the brake. drum 1., Anex tending arm x1 carrying an I adjustable weight g is. attached to the movable memper-9a account f the engagement between he-no lj it will be "seen :that a movement Lot, the brake .drum 1 in either direction will be t an m e t the m rab e m mber? m ssame to swing oi tend t'oswing about its support 10 in the direction of such movement. This movement of the member 9 moves the supports 8 and 11, butlas these supports are difi'erent distances from the atable member Hand thebrake drum center 10 about which they are moved, it

will be seen that the same angular movement of the member 9 produces a greater linear movement of the supporting point 8 than of the support 11 and the relativeposi tion of these pointsof support increases the difference in effective linear motion, as to the tightening or loosening of the brake-band 4. It will thus be seen that a clockwise movement of the brake drum 1 will cause a tightening of the brake band 4 through the move ment transmitted to the support 8. This tightening of the brake band 4 causes the same to operate to gripthe brake drum and prevent further movement in this direction.

. linear movement of the support 8 over the support lland this loosening permits the brake band 4 to spring away from the brake Should the brake drum 1 be moved inja drum 1, thus releasing the same and pre- .venting a free movement in this direction.

The purpose of thearm 15 and adjustable weight 16 is to keep the brake normally in' position to grip the brake drum 1 and prevent movement in a clockwise direction.

This part of the device maybe dispensed i with, however, where a similar movement of the brake drum in taking up the looseness of the brake band would not interfere with the operation of the mechanism controlled for clearance and also to take up Wear and stretching of the parts,v

5 It will thus be seen that a simple and efficient automatic control for a band brakeivhich may" be used in connectioiii-tv ith 'fi arious mechanisms.

Asmany changes could be made in the Widely :difierent} embodiments of my invention designed without departing from the 1 a; scope :of the appended claims; I inten'd'that allmatterfcontained in the above descrip tion or shown i'nhth'e accompa i1yingdraW- ingssha'li be 1 interpreted as illustrative merely of an operative" 'emb'odiment"-01? my invention and not in alimlti ng-sen'sei 1. In a device of the character described; in combination, a brake a 'brake' 'band surrounding said "drum; a 'pivotally mount;

h ed movable member to which the ends 'of said band areattached at dififerent' distances from said pivot, and a resilient rotary mem ber mounted :upon "Sftld "movablednember in Jengageinen t'i'with said drum whereby the n tial'fmovement of said drum is transmlt- 'ifeleases said ba nd and means for normally iin engagement with the drum. a, q 2. In a "devic'eof the characterdescribed,

movable member to which theends. of said from said pivot, and a resilient rotary member mountedupomsaid :movable member at theend opposite its pivot and in engagement With said: drum whereby the initial anovemeet of "said :drum is: :transmitted to 5 said movable member and tightensor releases RUTHYWIDLINSKY. v

1 ted tosaidfmovable member and tightens or band are attached at :"different "distances amta'i'ni'ng said "resilient rotary member in combination; a brake drum, a :bmkeband g v v "surrounding said drum, a plvotally mounted above I (ZOIIStIHCtIOH and many f apparently 

